Think coasters are the last thing Busch needs at this moment. Whilst I loved the place, for all of our group coming from the UK, it was the least memorable of all Florida Parks (didn't visit Legoland). I think this is because it was basically just a much improved, better landscaped, version of some UK parks. I also thought the standards of service were poor and ride dispatch extremely poor even compared to Seaworld - probably not as well staffed as the Orlando Parks.
We have better water rides in the UK which says something. I'd like to see rides along the lines of Antarctica at Seaworld, but on a grander scale. The animal exhibits were amazing but I didn't feel there was much synergy between animals and the actual rides. Seaworld achieved this through the shows I felt.